Mold core



July 1, 1941. 1, E. QD NDAHL 22473517 MOLD CORE Filed March 9, 1940 2 Sheets-Sheet 1 Invenior 4 E Odendahl By his Aziorne 6 %M W%Q July 1, 1 941.

\ l. E. ODENDAHL MOLD CORE Filed March 9, 1940 2 Sheets-Sheet 2 Jnvenior Jrzre L. Oc/endahl B2 his Alforne s WvW M? WOW/M Patented July 1, 1941 MOLD cone Irve E.- Odendahl, Minneapolis, Minn, assignor to l Elk River Concrete Products Company, Elk

River, Minn., a corporation of Minnesota Application March 9, 1940, Serial No. 323,221

1 Claim.

My present invention provides a highly efiicient knock down molding flask especially adapted for the molding of monolithic concrete culvert terminals, such as disclosed and claimed in a companion application filed by me of even date herewith and entitled Monolithic concrete culvert terminal. Generally stated, the invention consists of the novel devices, combinations of devices and arrangement of parts hereinafter described and defined in the claim. The drain pipe or culvert terminal of the above character is made up of a tubular anchoring portion and a flaring trough-like apron portion cast as a monolithic unit. The improved flask for the casting of these monolithic structures involves an inner shell and an outer shell, which shells are spaced to give the above indicated form to the concrete structures.

Generally stated, the object of the invention is to provide a molding flask of the above character that may be quickly setup, that will be highly efflcient to produce the casting or molding action and which may be quickly knocked down or separated for removal from the concrete casting.

A commercial form of the improved molding flask is illustrated in the accompanying drawings wherein like characters indicate like parts throughout the several views.

Referring to the drawings:

Fig. 1 is a plan view of the completeflask showing the same set in a vertical position ready to receive the concrete;

Fig. 2 is an elevation of the flask shown in Fig. 1, some parts being broken away;

Fig. 3 is a section takenon the line 3-3 of Fig. 2;

Fig. 4 is a vertical axial section taken on the line 44 of Fig. 1;

Fig. 5 is a fragmentary section taken on the line 5-5 of Fig. 2;

Fig. 6 is a fragmentary view of parts shown in the immediate vicinity of the line marked 6-6 on Fig. 4; and

Fig. 7 is a fragmentary section taken on the line 1-1 of Fig. 2.

The improved flask is made up of an outer shell and a contractable inner shell or core, which shells are properly spaced to receive the molding material between them. Both the inner and the outer shell comprise a'cylindrical portion and a flaring trough-forming apron portion. Both shells in their flaring trough-forming apron portions are formed with large flaring notches or open portions that form the corresponding large openings in the cast culvert terminal. The outer shell is made expansible and the inner shell or core is made contractable for ready removal from the cast culvert terminal.

In this commercial device illustrated in the drawings, the outer shell is made up of bi-sy'mmetrical sections, in rights and lefts, and each section comprises a semi-cylindrical tube forming portion In and a flaring trough-forming portion I l; and these sections are adapted to be detachably but rigidly locked together atthe' vertical joints I2 by suitable lock devices shown as consisting of hook-acting lock levers l3 pivoted to one of the sections and engageable with lock pins 14 on the abutting sections. i i

The inner shell or core involves a cylindrical tubular portion l5 and a flaring trough-forming apron portion IS. The trough-forming apron portions of both inner and outer shells are formed at their tops with large outwardly flaring approximately V-shaped openings, the sides of which diverge approximately from the cylindrical portions of the two shells forward to the rims or free ends thereof, as best indicatedin Fig. 2; and the space between these diverging walls is arranged to be normally closed by diverging sealing strips or flanges l1, see particularly Figs. 2, 3 and 5, by reference to which it will be noted that the sealing flanges I! have outward projecting portions to which rivet-like pins or the like l8 are secured. Thesepins l8 have slots through which wedges l9 orthe like are driven to rigidly clamp together the inner and outer shells and keep thesame properly spaced as indicated in the drawings. The said outwardly flaring approximately V-shaped openings of the inner and outer shells are each defined by two spaced outwardlydiverging apron sides and said openings are each disposed opposite a transversely relatively flat apron side of the shell in which it is formed.

The inner shell, as stated, is cylindrical when properly setup but has a longitudinal slit '20 so that when the abutting edges of the inner shell are oiiset, said inner shell may be contracted or collapsed for removal from the cast or molded culvert terminal. By reference to the drawings it will be seen that the slit 20 intersects the apex portion of the outwardly flaring apron openings of the inner shell or core.

For the purpose of locking the abutting edges of the inner shell in alignment with the inner shell at full expansion, I provide lock devices which, as shown in Figs. 2 and 6, are lock hooks 2| pivoted at 22 to the interior of the inner shell and worked through notches 23 in a flange of a reinforcing angle 24 that is welded or otherwise rigidly secured to one of the edges of the inner shell. The abutting edge between the edges of the inner shell or at the top thereof is in the same vertical plane as the abutting edges 12 of the outer shell and this abutting edge in Fig. 6 is indicated at 25. In Fig. 7 the reinforcing angle 24 is shown as welded to one edge portion of the inner shell at 26 with its flange overlappin'g the joint 25.

Also, as shown in the drawings, and preferably, the bi-symmetrical sections of the outer shell are reinforced by segmental angle bars 21, 28 and 29.

The inner shell or core is further reinforced by longitudinal angle beams 30 and 3!, welded or otherwise secured to the interior thereof. The sections of the outer shell are shown as provided with loop-like handles 32 applied to the reinforcing segments 28. able for pulling the outer shell sections off from the molded concrete.

For contracting. the inner shell or core to remove the same from the interior of the molded concrete, I have shown a suitable device involving a thrust bar 33 located substantially at the axis of the inner shell. This thrust bar 33 is connected to the interior of the inner shell by toggle-acting links 34 and 35. There are three duplicate sets of the links 34 pivotally connected at their inner ends to the said thrust bar and at their outer ends pivotally connected, two thereof to flanges of the reinforcing bar 3! and one thereof tothe flange of the reinforcing bar 30. All of these links (34 are Within the flaring trough-like portion of the shells or, in other words, under the diverging openings, which latter are marked with the character a on Fig. 2 only. There are four duplicate sets of' the shorter toggle links 35 pivotally connected at their inner ends to the thrust bar 33 and pivotally connected at their outer ends, one thereof to the flange of the short reinforcing bar 24, one thereofto. the flange of the reinforcing angle 30 and two thereof to flanges of the reinforcing angles 3|. v I

When the flask is conditioned for molding, it

, willbe set vertically or upright, as best shown in Fig, 2, with its open end resting on a flat surface such" as the floor or the like. To form a telescopic joint between the cylindrical portion of the concrete casting and an adjacent concrete pipe-section, a joint ring 36- is setin the space between the ends of the inner and outer shells.

When the coupling or lock-pins I8 and wedges I9 are applied, as shown in Fig. 5, the inner and outer casings will be spaced in concentric arrangement and; in condition to receive the fluid cement. When the lower end of the molding flask is set upright on a concrete floor or other base, the lower end thereof will be closed. and at the upper end of the flask there will be an opening extending from o to 0', as viewed on Fig. 1, through which the cement will be poured into the flask.

These handles are servicei When the cement is hardened, the flask must, of course, be removed and this may be readily accomplished as follows: As the first step, the wedges l9 and pins l8 should be removed so that the inner and outer shells can be separated. As the next step, the latch hooks l3 should be released so that the two outer shell sections Ill-ll can be separated and removed from the casting. By taking hold of the handles 32, this removal of the sections of the outer shell may be easily accomplished.

To contract the inner shell so that it can be readily removed, the thrust bar 33 should be 7 pulled outward so as to buckle the toggles 34 and 35, as shown by dotted lines in Fig, 1. The latches 2!, when applied, hold the inner shell positively against expansion. These latches 2| are provided with beveled surfaces '2l which under the contracting action of the toggles 34 and 35 cause release of the said latches and permit the contraction of the inner shell necessary for the removal thereof from the concrete casting. By reference to Fig. 7 it will be noted that the reinforcing angles 24' are Welded at 26' to one edge of the inner shell and overlap the other edge so that the abutting edges of the inner shell are normally held aligned. The initial buckling action produced by the above noted movement of the thrust bar and. toggles pulls the flange of the reinforcing bar 24 away from the overlapped inner edge of the shell and thereby permits the said inner shell to be contracted by pulling the inner sections of the toggles.

Of course, in setting up theflask for molding action the releasing actions above described are substantially reversed.

In actual practice the flask'above described has been found eflicient for the purposes had in view and by the use thereof the pre-cast monolithic so-called concrete terminals may be produced at comparatively low cost. Of course it will be understood that While I have, in accordance with the statutes, disclosed a complete operative device that the said device or apparatus is capable of modifications within the scope of the-invention disclosed and herein claimed.

What I claim is:

In a mold for molding monolithic culvert terminals, a contractable shell-like mold core comprising a tubular portion and a trough-like apron portion extending from and forming an uninterruptedcontinuation of saidtub'ular' portion; said apron portion-having a transversely relatively flat side that flares outwardly-toward the free end of the apron portion and, having two opposed outwardly diverging sides: defining an opening therebetween in the side thereof oppo site the said flat side and which opening flares toward the free end of the apron portion, and a slit extending longitudinally through the tubular end intersecting the apex portion of the flaring opening of said apron portion.

IRVE E. ODENDAHL. 

